Added first exercise

ex_01_01.py

@@ -0,0 +1,18 @@
+#!/usr/bin/python3
+
+import cmath
+import math
+
+if( __name__ == "__main__"):
+	log = cmath.log(-16)
+	sqrt = cmath.sqrt(-16)
+	print("logarithm:", log)
+	print("\tabsolute value:", abs(log))
+	print("square root:", sqrt)
+	print("\tabsolute value:", abs(sqrt))
+
+	# rotate (7, 3) counter-clockwise (math. positive) arount (0, 0)
+	c = 7 + 3j
+	c_prime = c * cmath.exp(1j * math.radians(30))
+
+	print("Rotated (7,3) by 30 degs:", "({}, {})".format(c_prime.real, c_prime.imag))